Effect of outrigger-belt truss location on the dynamic response of high-rise building subjected to blast loading

Abstract

High rise structures are more vulnerable to earthquake loads. Hence to build this high rise structures stable an external frame works is required to increase its resistance against the seismic tremor one of such system is the belt truss systems. In this study, the response of steel tubular structures with and without the belt truss systems subjected to earthquake forces is evaluated under the seismic zone V considering 70 storey steel tubular structures for analysis. The analytical method used in this dissertation work is Time History Method. Time history analysis is performed by using BHUJ earthquake data. The software utilized for the analysis is ETABS v 9.7.4. Also, the location of belt truss in the tube in tube and framed tube structures and comparison of these steel tubular structures with the steel moment resisting frames are carried out. In this work, various parameters like storey drifts, storey displacements, time period and base shear has been evaluated for different models and have been compared to obtain an efficient structure.

Outrigger and Belt‐Truss System Design for High‐Rise Buildings: A Comprehensive Review Part II—Guideline for Optimum Topology and Size Design

“…Also, simplified modeling methods are fast and yield reasonably accurate design parameters if used correctly and a suitable set of assumptions is chosen. e multiple features of the simplified methods make the use of these methods vital during the initial design stage in order to determine the general design characteristics and initial parameters such as the dimensions of members in rational values and during the final design stage in order to check the computer analysis results manually [12,38,40,58,59,[61][62][63].…”

“…In general, the tall buildings with the outrigger and belttruss system can be idealized, using continuum approach, as a flexural and shear cantilevered beam with rotational springs positioned at the outrigger and belt truss location [36,61,77,78].…”

“…(iii) Special lateral loads (blast loads): blast is a pressure disturbance arising from a sudden release of energy, due to terrorist or accidental explosions [61,92].…”

“…Considering this type of load in tall building design is important to check the safety of the building against progressive collapse. Several reviewed papers studied this phenomenon, such as [39,61,93]. However, there are high uncertainties of blast load calculations [39].…”

“…However, there are high uncertainties of blast load calculations [39]. e two main factors impacting the magnitude of blast loads on the building are (i) the standoff distance from the structure to the blast source and (ii) the bomb size or charge weight [61] (see Figure 6). In order to present a blast wave relationship for high explosive, the Hopkinson-Cranz method (cube root scaling method) can be used [92], while for predicting blast loads, special expressions can be used, such as the equation introduced by Brode [94], the relationship introduced by Newmark and Hansen [95], or expression introduced by Mills [39,96].…”